Bulk amorphous alloys with hard magnetic properties were produced by a copper mold casting method for Fe45Nd45A10, Fe45Nd40Al15 and Fe42.5Nd 42.5Al15 alloys in a cylindrical form with diameters of 3, 3 and 4 mm, respectively. The crystallization temperature (TX) and melting temperature (Tm) of the Fe42.5Nd 42.5Al15 bulk amorphous alloy are 813 and 877 K, respectively. Accordingly, the temperature interval between Tm and TX, ΔTm (=Tm-Tx), is as small as 64 K and the reduced crystallization temperature (Tx/T m) is as high as 0.93. The small ΔTm and high T x/Tm values are presumed to be the origin for the achievement of the high amorphous-forming ability of the Fe-Nd-Al alloy. The Fe45Nd45A10, Fe45Nd 40Al15 and Fe42.5Nd42.5Al 15 bulk amorphous cylinders with a diameter of 1 mm exhibit hard magnetic properties of 0.212-0.248 T for magnetization, 0.124-0.171T for remanence and 156-245kA/m for intrinsic coercive field at room temperature. The hard magnetic properties for these bulk amorphous alloys tend to transform to the soft type with decreasing diameter of the cylindrical samples. These Fe-Nd-Al bulk amorphous alloys with hard magnetic properties and high amorphous-forming ability are promising for future progress as a new type of Fe-based magnetic material.
|ジャーナル||Journal of Optoelectronics and Advanced Materials|
|出版ステータス||Published - 2006 10月|
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